feat: fix lint errors

src/firebase_functions/logger.py

@@ -12,7 +12,7 @@
 class LogSeverity(str, _enum.Enum):
     """
     `LogSeverity` indicates the detailed severity of the log entry. See
-    `LogSeverity <https://cloud.google.com/logging/docs/reference/v2/rest/v2/LogEntry#logseverity>`_.
+    `LogSeverity <https://cloud.google.com/logging/docs/reference/v2/rest/v2/LogEntry#logseverity>`.
     """
 
     DEBUG = "DEBUG"

src/firebase_functions/private/_identity_fn.py

@@ -321,7 +321,7 @@ def _generate_response_payload(
     result = {}
     update_mask = ",".join(formatted_auth_response.keys())
 
-    if len(update_mask):
+    if len(update_mask) != 0:
         result["userRecord"] = {
             **formatted_auth_response, "updateMask": update_mask
         }